Islip (ISP) to Baltimore (BWI): On-Time Performance
Data through July 2026
When you fly ISP to BWI matters as much as anything else about the booking: the route swung from 96% on-time in September 2025 to just 73% in July 2025. Across the full period the route averages 85% on-time against a national 78%. Morning departures also hold up better than evening ones (93% vs 70%), which matters most in the rough months.
- On-time
- 85%
- arrived <15 min late
- Avg delay
- 12 min
- completed flights
- Cancelled
- 1.2%
- Flights/day
- 3.4
- last 12 months
- Duration
- 1h 18m
- scheduled
- Distance
- 220 mi
Monthly on-time trend
Best time to fly from ISP to BWI
Aim for departures around 9 a.m. (98% on-time); avoid 6 p.m. departures (62%).
By day of week
| Day | On-time | Avg delay |
|---|---|---|
| Monday | 81% | 18 min |
| Tuesday | 85% | 9 min |
| Wednesdaybest | 86% | 10 min |
| Thursday | 84% | 12 min |
| Friday | 86% | 9 min |
| Saturday | 86% | 10 min |
| Sunday | 84% | 12 min |
What causes delays on this route
Share of total delay minutes by cause, as reported by carriers to the US DOT.
- Late-arriving aircraft46%
- Airline operations26%
- National airspace system24%
- Weather4%
Frequently asked questions
- How often are flights from ISP to BWI delayed?
- 15% of ISP–BWI flights arrived 15 or more minutes late (the US DOT definition of a delay) between 2024-07 and 2026-07. The average arrival delay across completed flights was 12 minutes.
- What is the best time of day to fly from ISP to BWI?
- Departures around 9 a.m. have the best record (98% on-time), while departures around 6 p.m. have the worst (62%). As on most US routes, delays accumulate through the day, so earlier flights are generally safer.
- How long is the flight from ISP to BWI?
- The scheduled ISP–BWI flight time averages 1h 18m over 220 miles. Actual arrival times vary — flights on this route land 15+ minutes late 15% of the time.
- How often are ISP to BWI flights cancelled?
- 1.2% of scheduled flights on this route were cancelled between 2024-07 and 2026-07, at or below the national rate of 1.6%.
- What is the worst month to fly from ISP to BWI?
- July 2025 was the roughest month in this dataset, with only 73% of arrivals on time. The best was September 2025 at 96%. If your dates are flexible, that 23-point gap is worth planning around.
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Based on 2,563 flights, 2024-07–2026-07. Source: US DOT Bureau of Transportation Statistics. Updated 2026-09-28.